It can be as you say TT, after a Punter has Cum in his 'plastic bag'. However I would take it that the WG is suggesting that a Punter either 'cums' on her pussy and he licks it off,thus 'Clean up', which to me is one step away from Bareback on the WG's behalf or I've seen it as a Punter cleaning up AFTER another has either 'cum in her' or on her., which again brings Bareback into mind.